package com.szjk.gateway.config;

import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author chenxinglin
 * @version 1.0
 * @description swagger 配置
 * @date 2021-12-02 09:59
 * @company szjk
 */
@Component
@Primary
@RequiredArgsConstructor
public class SwaggerResourcesConfig implements SwaggerResourcesProvider {

    public static final String API_URI = "/v2/api-docs";

    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;

    /**
     * 网关应用名称,不需要在网关的swagger 上展示
     */
    private String appName = "gateway-service";

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
//        List<String> routes = new ArrayList<>();
//        //取出gateway的route
//        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        //结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
        gatewayProperties.getRoutes().stream() .filter(route -> route.getUri().getHost() != null)
                .filter(route -> !appName.equals(route.getUri().getHost()))
                .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                        .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                        .forEach(predicateDefinition -> resources
                                .add(swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
                                        .get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", API_URI)))));
        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }
}
